Using xsane with a Canon CanoScan LiDE 60 on Debian Etch

I got an inexpensive flatbed USB scanner and was disappointed with the bundled (Windows-only) software, so I tried it on Linux. Debian Etch installs xsane by default, but it would not recognize the scanner. I tried a whole bunch of things but nothing help, until I accidentally started xsane from a root terminal, and it “just worked”, despite the warning from xsane about running as root.